Buggy code:
public class MatchLocator implements ITypeRequestor { public SearchPattern pattern ; public int detailLevel ; public IJavaSearchResultCollector collector ; public IJavaSearchScope scope ; public MatchLocatorParser parser ; private INameEnvironment nameEnvironment ; public NameLookup nameLookup ; public LookupEnvironment lookupEnvironment ; public HashtableOfObject parsedUnits ; public MatchingOpenableSet matchingOpenables ; private MatchingOpenable currentMatchingOpenable ; public HandleFactory handleFactory ; public IWorkingCopy [ ] workingCopies ; private static char [ ] EMPTY_FILE_NAME = new char [ 0 ] ; public MatchLocator ( SearchPattern pattern , int detailLevel , IJavaSearchResultCollector collector , IJavaSearchScope scope ) { } public void accept ( IBinaryType binaryType , PackageBinding packageBinding ) { } public void accept ( ICompilationUnit sourceUnit ) { } public void accept ( ISourceType [ ] sourceTypes , PackageBinding packageBinding ) { } public CompilationUnitDeclaration buildBindings ( org . eclipse . jdt . core . ICompilationUnit compilationUnit ) throws JavaModelException { } public IField createFieldHandle ( FieldDeclaration field , IType type ) { } public IJavaElement createImportHandle ( ImportReference importRef ) { } public IInitializer createInitializerHandle ( TypeDeclaration typeDecl , FieldDeclaration initializer , IType type ) { } public IMethod createMethodHandle ( AbstractMethodDeclaration method , IType type ) { } private ClassFileReader classFileReader ( IType type ) { } public IType createTypeHandle ( char [ ] simpleTypeName ) { } public IType createTypeHandle ( IType parent , char [ ] simpleTypeName ) { } protected IResource getCurrentResource ( ) { } protected Scanner getScanner ( ) { } public void locateMatches ( String [ ] filePaths , IWorkspace workspace , IWorkingCopy [ ] workingCopies , IProgressMonitor progressMonitor ) throws JavaModelException { } public void locatePackageDeclarations ( IWorkspace workspace ) throws JavaModelException { } private void locatePackageDeclarations ( SearchPattern searchPattern , IWorkspace workspace ) throws JavaModelException { } public IType lookupType ( TypeBinding typeBinding ) { } public void report ( int sourceStart , int sourceEnd , IJavaElement element , int accuracy ) throws CoreException { } public void report ( IResource resource , int sourceStart , int sourceEnd , IJavaElement element , int accuracy ) throws CoreException { } public void reportBinaryMatch ( IMember binaryMember , IBinaryType info , int accuracy ) throws CoreException , JavaModelException { } public void reportBinaryMatch ( IResource resource , IMember binaryMember , IBinaryType info , int accuracy ) throws CoreException , JavaModelException { } public void reportFieldDeclaration ( FieldDeclaration fieldDeclaration , IJavaElement parent , int accuracy ) throws CoreException { } public void reportImport ( ImportReference reference , int accuracy ) throws CoreException { IJavaElement importHandle = this . createImportHandle ( reference ) ; <START_BUG> this . pattern . matchReportReference ( reference , importHandle , accuracy , this ) ; <END_BUG> } public void reportMethodDeclaration ( AbstractMethodDeclaration methodDeclaration , IJavaElement parent , int accuracy ) throws CoreException { } public void reportPackageDeclaration ( ImportReference node ) { } public void reportPackageReference ( ImportReference node ) { } public void reportAccurateReference ( int sourceStart , int sourceEnd , char [ ] [ ] qualifiedName , IJavaElement element , int accuracy ) throws CoreException { } public void reportAccurateReference ( int sourceStart , int sourceEnd , char [ ] [ ] tokens , IJavaElement element , int [ ] accuracies ) throws CoreException { } public void reportReference ( AstNode reference , AbstractMethodDeclaration methodDeclaration , IJavaElement parent , int accuracy ) throws CoreException { } public void reportReference ( AstNode reference , TypeDeclaration typeDeclaration , FieldDeclaration fieldDeclaration , IJavaElement parent , int accuracy ) throws CoreException { } public void reportSuperTypeReference ( TypeReference typeRef , IJavaElement type , int accuracy ) throws CoreException { } public void reportTypeDeclaration ( TypeDeclaration typeDeclaration , IJavaElement parent , int accuracy ) throws CoreException { } private MatchingOpenable newMatchingOpenable ( IResource resource , Openable openable ) { } private void addMatchingOpenable ( IResource resource , Openable openable ) throws JavaModelException { } public void createParser ( JavaProject project ) throws JavaModelException { } private INameEnvironment getNameEnvironment ( JavaProject project ) throws JavaModelException { } public CompilationUnitDeclaration dietParse ( final char [ ] source ) { } public char [ ] findSource ( ClassFile classFile ) { } public IBinaryType getBinaryInfo ( ClassFile classFile , IResource resource ) throws CoreException { } protected Openable getCurrentOpenable ( ) { } private void locateMatches ( JavaProject javaProject , IProgressMonitor progressMonitor ) throws JavaModelException { } }

Fix:
this . pattern . matchReportImportRef ( reference , null , importHandle , accuracy , this ) ;